About this replacement
Custom Battery Pack 1ICP/5/30/48 1S1P — 3.7V Li-ion Replacement Battery
This is a 3.7V 750mAh (2.78Wh) Li-ion single-cell replacement battery pack. It carries OEM part number 1ICP/5/30/48 1S1P and fits compact portable electronics that run on proprietary 1S1P cell configurations. If the original pack has degraded or failed, this unit restores the device to working condition.
- 1S1P single-cell configuration: One cell, no parallel arrangement — this topology is common in lightweight portable devices where board space and weight are tight. The 3.7V nominal rail matches the charge IC input range on these platforms directly, with no step-down conversion required.
- Bench tested on actual hardware: We cycled this pack through charge and discharge on the bench. The integrated BMS held the cell within safe voltage limits, engaging protection cutoff correctly at both ends of the charge curve without false trips.
- First-cycle calibration: If your device uses a fuel gauge IC, run one full charge-to-discharge cycle after installing this pack. The gauge chip recalibrates its capacity model against the new cells — without this step, the capacity indicator may read inaccurately for the first several uses.
Pack running at lower voltage than rated on first power-on
Replacement Li-ion packs ship at storage voltage — typically 3.6V to 3.85V rather than the 4.2V full-charge ceiling. This is intentional. Storing cells at full charge accelerates electrolyte degradation during transit and warehousing. If the device reads low battery immediately after install, charge the pack fully before drawing any load. One complete charge cycle to 4.2V will bring the cell to rated operating condition.
Device rejecting the pack after swap — no power-on response
Some portable electronics run a voltage window check or BMS handshake before allowing the pack to supply the main board. If the replacement pack arrives below the device's minimum acceptance threshold, the firmware may block power-on entirely. Connect the device to its charger first, before attempting to power on. Once the charge IC brings the pack above the threshold voltage — usually around 3.0V to 3.4V — the handshake completes and the device will boot normally.